Borrowings - Summary of Borrowings (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Line of Credit Facility [Line Items] | ||
| Total borrowing capacity | $ 47,000,000 | $ 40,500,000 |
| Outstanding advances | 0 | 0 |
| Private Bankers' Bank | ||
| Line of Credit Facility [Line Items] | ||
| Maximum amount outstanding an any month-end during the period | 0 | 459,000 |
| FHLB of Topeka | ||
| Line of Credit Facility [Line Items] | ||
| Average balance outstanding | 1,324,000 | 1,752,000 |
| Maximum amount outstanding an any month-end during the period | 8,500,000 | 8,000,000 |
| Federal Reserve Bank Advances | ||
| Line of Credit Facility [Line Items] | ||
| Maximum amount outstanding an any month-end during the period | 0 | 0 |
| Federal Home Loan Bank Of Topeka and Private Banker's Bank | ||
| Line of Credit Facility [Line Items] | ||
| Maximum amount outstanding an any month-end during the period | $ 8,500,000 | $ 8,459,000 |
| Average interest rate during the period | 4.46% | 5.65% |